# CVE-2026-58534: Microsoft IME heap buffer overflow privilege escalation

Source: https://junglewise.ai/threats/cve-2026-58534-microsoft-ime-heap-buffer-overflow-privilege-escalation  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-07-14. Updated: 2026-07-14  
License: CC BY 4.0 with a link back

CVE-2026-58534 · Severity: high · CVSS 8.8 · Published 2026-07-14

A security vulnerability exists in the Microsoft Input Method Editor (IME), a component used to enter text in languages like Chinese, Japanese, and Korean. An attacker who already has basic access to a computer could exploit this flaw to gain full administrative control over the system. This could allow them to install programs, view or delete sensitive data, or create new accounts with full user rights.

Technologies: [Microsoft Windows 11](https://junglewise.ai/threats/technologies/windows-11), [Microsoft Windows 10](https://junglewise.ai/threats/technologies/windows-10), [Microsoft Windows Server 2016](https://junglewise.ai/threats/technologies/windows-server-2016). Vendors: [Microsoft](https://junglewise.ai/threats/vendors/microsoft).

## Quick answers

**Is CVE-2026-58534 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-58534 being exploited in the wild.

**How severe is CVE-2026-58534?** High severity, with a CVSS score of 8.8, published 14 July 2026.

**Which products and versions are affected?** Microsoft Windows 11 24H2, 25H2, 26H1; Microsoft Windows 10 1607, 1809, 21H2, 22H2; Microsoft Windows Server 2016 All versions.

**Is there a fix for CVE-2026-58534?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-58534 attacked?** It is attacked with local access, in an operating system.

**Am I affected by CVE-2026-58534?** Check whether you run Microsoft Windows 11, Microsoft Windows 10 or Microsoft Windows Server 2016 at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A heap-based buffer overflow (CWE-122) exists in the Microsoft Input Method Editor (IME). The vulnerability is triggered locally by an authorized user with low privileges. By exploiting this memory corruption issue, an attacker can achieve local privilege escalation (LPE), potentially gaining SYSTEM-level access. The vulnerability has a CVSS score of 8.8, reflecting its high impact on confidentiality, integrity, and availability, as well as its ability to cross security scopes. Microsoft has released security updates to address this issue across affected versions of Windows 10, Windows 11, and Windows Server.

## Affected products

- Microsoft Windows 10 1607, 1809, 21H2, 22H2
- Microsoft Windows 11 24H2, 25H2, 26H1
- Microsoft Windows Server 2016 All versions

## Timeline

- 2026-07-14: disclosed
- 2026-07-14: advisory

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58534](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58534)

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